Ironton Threshold Days by Year (USC00333971)

18 fixed thresholds counted per year at Ironton (USC00333971): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ironton Thresholds

Ironton: days with a maximum temperature at or above 30 C (86 F) in 80 years, most in 1959 with 109.
Ironton: days with a maximum temperature at or above 90 F (32.2 C) in 80 years, most in 1936 with 84.
Ironton: days with a maximum temperature at or below 0 C (32 F) in 80 years, most in 1977 with 35.
Ironton: nights with a minimum temperature at or below 0 C (32 F) in 80 years, most in 1976 with 135.
18 fixed thresholds have at least one qualifying day at Ironton.

Days at or above 30 C (86 F)

80 years with a qualifying day

Days per year at Ironton with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 109 in 1959.

Days at or above 30 C (86 F) per year at Ironton
Year	Days	Decade average
1900	100	79.4
1901	72	79.4
1902	69	79.4
1903	78	79.4
1904	73	79.4
1905	76	79.4
1906	98	79.4
1907	65	79.4
1908	96	79.4
1909	67	79.4
1910	77	84
1911	101	84
1912	77	84
1913	96	84
1914	98	84
1915	67	84
1916	83	84
1917	78	84
1918	78	84
1919	85	84
1920	59	69.6
1921	90	69.6
1922	83	69.6
1923	69	69.6
1924	49	69.6
1925	83	69.6
1926	69	69.6
1927	56	69.6
1928	60	69.6
1929	78	69.6
1930	108	91.8
1931	96	91.8
1932	104	91.8
1933	96	91.8
1934	106	91.8
1935	69	91.8
1936	107	91.8
1937	82	91.8
1938	64	91.8
1939	86	91.8
1940	68	85.2
1941	94	85.2
1942	84	85.2
1943	103	85.2
1944	105	85.2
1945	81	85.2
1946	60	85.2
1947	74	85.2
1948	88	85.2
1949	95	85.2
1950	55	85.8
1951	85	85.8
1952	86	85.8
1953	94	85.8
1954	98	85.8
1955	89	85.8
1956	76	85.8
1957	97	85.8
1958	69	85.8
1959	109	85.8
1960	65	76.8
1961	63	76.8
1962	84	76.8
1963	65	76.8
1964	94	76.8
1965	84	76.8
1966	78	76.8
1967	65	76.8
1968	73	76.8
1969	97	76.8
1970	105	68
1971	70	68
1972	50	68
1973	64	68
1976	61	68
1977	81	68
1978	65	68
1979	48	68
1980	80	71.5
1981	63	71.5

For each year, a bar from the first to the last day at Ironton meeting 30 C (86 F).

First to last qualifying date each year at Ironton
Year	First date	Last date
1900	1900-05-12	1900-10-07
1901	1901-04-30	1901-09-10
1902	1902-04-22	1902-09-22
1903	1903-04-29	1903-10-04
1904	1904-05-06	1904-10-09
1905	1905-04-10	1905-09-30
1906	1906-04-13	1906-09-28
1907	1907-03-22	1907-10-03
1908	1908-04-26	1908-10-19
1909	1909-04-18	1909-09-22
1910	1910-03-24	1910-10-17
1911	1911-05-10	1911-10-06
1912	1912-04-12	1912-10-11
1913	1913-04-23	1913-10-10
1914	1914-04-18	1914-10-07
1915	1915-04-21	1915-10-04
1916	1916-04-20	1916-10-08
1917	1917-04-17	1917-10-18
1918	1918-05-04	1918-10-05
1919	1919-04-09	1919-10-03
1920	1920-04-22	1920-10-23
1921	1921-03-20	1921-09-17
1922	1922-04-07	1922-10-06
1923	1923-05-03	1923-09-04
1924	1924-05-06	1924-09-01
1925	1925-04-19	1925-09-20
1926	1926-05-01	1926-09-23
1927	1927-04-19	1927-10-06
1928	1928-05-03	1928-10-13
1929	1929-03-24	1929-09-29
1930	1930-04-11	1930-10-11
1931	1931-05-16	1931-10-07
1932	1932-05-04	1932-09-19
1933	1933-04-30	1933-09-26
1934	1934-04-03	1934-09-26
1935	1935-04-26	1935-09-25
1936	1936-05-02	1936-09-23
1937	1937-04-23	1937-10-06
1938	1938-04-26	1938-11-07
1939	1939-04-24	1939-10-10
1940	1940-05-06	1940-10-14
1941	1941-04-12	1941-10-07
1942	1942-04-05	1942-09-19
1943	1943-05-06	1943-10-11
1944	1944-04-22	1944-09-27
1945	1945-03-16	1945-10-01
1946	1946-04-02	1946-09-28
1947	1947-04-05	1947-10-16
1948	1948-04-20	1948-09-29
1949	1949-04-26	1949-10-11
1950	1950-03-27	1950-10-31
1951	1951-04-28	1951-10-05
1952	1952-04-21	1952-10-01
1953	1953-04-29	1953-10-21
1954	1954-03-25	1954-10-14
1955	1955-04-18	1955-09-29
1956	1956-04-27	1956-09-23
1957	1957-04-19	1957-09-21
1958	1958-04-18	1958-09-26
1959	1959-04-01	1959-10-05
1960	1960-04-13	1960-09-08
1961	1961-04-24	1961-09-25
1962	1962-04-25	1962-10-15
1963	1963-04-01	1963-10-07
1964	1964-04-17	1964-09-16
1965	1965-04-21	1965-09-22
1966	1966-03-22	1966-09-05
1967	1967-04-06	1967-10-05
1968	1968-05-02	1968-10-01
1969	1969-04-08	1969-10-13
1970	1970-04-30	1970-10-09
1971	1971-04-13	1971-10-03
1972	1972-04-18	1972-09-14
1973	1973-03-14	1973-09-28
1976	1976-04-17	1976-09-14
1977	1977-04-13	1977-09-25
1978	1978-05-20	1978-09-22
1979	1979-05-12	1979-10-23
1980	1980-05-06	1980-10-11
1981	1981-04-14	1981-09-27

Every Fixed Threshold

Fixed thresholds at Ironton
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	80	109	1959	63
35 C (95 F): Days	75	46	1930	3
40 C (104 F): Days	5	3	1930	1
90 F (32.2 C): Days	80	84	1936	24
100 F (37.8 C): Days	27	13	1930	1
0 C (32 F): Ice days (max	80	35	1977	19
0 C (32 F): Frost days (min	80	135	1976	135
-10 C (14 F): Days with min	80	42	1977	30
-20 C (-4 F): Days with min	23	6	1918	2
-30 C (-22 F): Days with min	1	1	1917	1
20 C (68 F): Tropical nights (min	80	48	1914	6
25 C (77 F): Days with min	8	8	1917	1
10 mm (0.39 in): Days with 10 mm or more rain	80	56	1935	33
25 mm (0.98 in): Days with 25 mm or more rain	80	18	1935	6
50 mm (1.97 in): Days with 50 mm or more rain	51	4	1939	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	41	4	1936	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1906	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

Data for Ironton threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Ironton Threshold Days by Year (USC00333971)

Key Facts for Ironton Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related